Super Mario RPG themed.
The next Tetris® 99 36th MAXIMUS CUP online event is giving you the opportunity to earn an in-game theme inspired by the Super Mario RPG™ game. During the event, collect 100 event points by playing matches in Tetris 99 mode to unlock the in-game theme.
There is Tetris Effect available on Switch, as well as Game Boy Tetris in NSO. Another great option is Puyo Puyo Tetris (and Puyo Puyo Tetris 2).